Diagnosis
A MATB1 certificate may only be issued from the 26th week of pregnancy.The qualifying week, however, is calculated as the date 15 weeks beforethe expected week of confinement (EWC) date, therefore as the 25th weekof pregnancy.
The employee's qualifying week date must therefore be earlier than theMATB1 date. However, in the case of the dates you have entered, theMATB1 date is the earlier date.

Procedure
Check the dates you have entered and correct them if necessary.
However, if the dates you have entered are correct, but the MATB1certificate date is prior to the qualifying week date, then thecertificate is not valid.